Plasmonic nonreciprocity driven by band hybridization in moir\'e materials

TL;DR

This paper introduces a current-driven mechanism for achieving significant plasmon dispersion nonreciprocity in moiré materials with hybridized electron bands, highlighting the role of electron interactions and damping effects.

Contribution

It proposes a new mechanism for plasmon nonreciprocity driven by band hybridization and electron interactions in moiré materials, emphasizing the control via interaction strength and damping suppression.

Findings

Nonreciprocal plasmon dispersion achieved in moiré systems.

Effect magnitude scales with electron-electron interaction strength.

Enhanced plasmon lifetime when Landau damping is suppressed.

Abstract

We propose a new current-driven mechanism for achieving significant plasmon dispersion nonreciprocity in systems with narrow, strongly hybridized electron bands. The magnitude of the effect is controlled by the strength of electron-electron interactions $\alpha$, which leads to its particular prominence in moir\'e materials, characterized by $\alpha \gg 1$. Moreover, this phenomenon is most evident in the regime where Landau damping is quenched and plasmon lifetime is increased. The synergy of these two effects holds a great promise for novel optoelectronic applications of moir\'e materials.